JPWO2014069369A1 - Electric tool - Google Patents

Abstract

The electric power tool 1 includes a motor housing 3, a body portion 21 that houses the motor 3, and a substrate housing portion 23 that houses a substrate on which a control board that operates the motor 3 is mounted. A housing 2 having a handle portion 22 connected to the accommodating portion 23, a power cord 9 extending from the substrate accommodating portion 23 and connectable to an AC power source, a choke coil 86 and a film capacitor 88 for removing noise are provided. And a power supply circuit unit 8 for converting AC power supplied from the power cord 9 into DC power. The choke coil 86 and the film capacitor 88 are accommodated in the substrate accommodating portion 23. The handle portion can be made thin and short, and the assembly of the power tool can be improved.

Description

  The present invention relates to a power tool, and more particularly to a power tool that drives a motor using a commercial AC power supply as a power source.

  Conventionally, an electric power tool driven by electric power supplied from an AC power source to a motor, for example, an impact driver is known (for example, refer to Patent Document 1). The impact driver includes a film capacitor and a ferrite core for reducing electromagnetic noise, and includes a power supply circuit unit that converts AC power from an AC power source into DC power. The film capacitor and the ferrite core are housed in a handle unit. .

JP 2012-139747 A

  However, in the structure of the conventional impact driver, since the film capacitor and the ferrite core are accommodated in the handle portion, the handle portion is thicker and longer than necessary. Furthermore, since it is necessary to dispose the film capacitor and the ferrite core so as not to interfere with the signal line passing through the handle portion, the assemblability of the impact driver is poor.

  Accordingly, an object of the present invention is to provide an electric tool that can make the handle portion thin and short and has improved assemblability.

  To achieve the above object, the present invention provides a motor, a body part for housing the motor, a board housing part for housing a board on which a control circuit for operating the motor is mounted, and one end connected to the body part. A housing having a handle portion connected to the substrate housing portion at the other end, a power cord extending from the substrate housing portion and connectable to an AC power source, and a noise removing component for removing noise, A power circuit unit for converting AC power supplied from the power cord into DC power, wherein the noise removing component provides the power tool housed in the board housing part .

  According to such a configuration, it is possible to prevent the interference of the signal line passing through the handle portion, and thus it is possible to prevent the signal line from being disconnected. In addition, since the signal lines in the handle portion can be easily wired, the assemblability of the power tool can be improved. In addition, since the noise removing component is not arranged in the handle portion, the grip portion of the handle portion can be made thin and short.

  Further, the body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the trunk portion along one direction in the order, and the noise removal is performed. It is preferable that the component is disposed at the one-direction side end portion in the substrate housing portion.

  According to such a configuration, the length of the electric tool in the direction in which the body portion, the handle portion, and the substrate housing portion are arranged can be shortened, and the electric tool can be made compact as a whole. Further, it is possible to prevent the substrate housing portion that houses the noise removal component from interfering with the operation during the work.

  Further, the body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the body portion along one direction in the order, and the substrate housing Preferably, the portion protrudes in the one direction, and the one-direction side end portion of the substrate housing portion is located on the motor side with respect to the tip tool holding portion.

  According to such a configuration, the projecting portion of the substrate housing portion does not hit the workpiece during work, and the substrate housing portion can be prevented from interfering with the work.

  Further, the body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the body portion along one direction in the order, and the noise removal is performed. It is preferable that the component is disposed at an end portion on the side opposite to the one-direction side in the substrate housing portion.

  According to such a configuration, the length of the electric tool in the direction in which the body portion, the handle portion, and the substrate housing portion are arranged can be shortened, and the electric tool can be made compact as a whole.

  Further, the noise removing component is disposed at a position substantially the same as the substrate or a position opposite to the substrate in the direction in which the body portion, the handle portion, and the substrate housing portion are arranged. It is preferable that

  According to such a configuration, it is possible to prevent the interference of the signal line passing through the handle portion, and thus it is possible to prevent the signal line from being disconnected. In addition, since the signal lines in the handle portion can be easily wired, the assemblability of the power tool can be improved. In addition, since the noise removing component is not arranged in the handle portion, the grip portion of the handle portion can be made thin and short.

  Moreover, it is preferable that a pressing member that suppresses shaking of the noise removing component is disposed in the substrate housing portion.

  According to such a configuration, since the pressing member is disposed around the noise removal component, it is possible to prevent the noise removal component from shaking during the operation of the electric power tool.

  Further, the noise removing component is preferably a choke coil and a capacitor.

  Further, the present invention is provided at a motor having a rotation shaft extending in the front-rear direction, a body part that accommodates the motor, a handle part extending from the body part, and an end part of the handle part opposite to the body part. A power tool including a housing having a protrusion protruding forward or / and rearward, a power cord extending from the protrusion and connectable to an AC power source, and a noise removing component for removing noise, The noise removing component provides a power tool accommodated in the protruding portion.

  According to such a configuration, since the noise removing component is provided on the protruding portion, the handle portion can be made thin and short.

  Moreover, it is preferable that the projecting portion accommodates a power supply circuit portion that converts AC power supplied from the power cord into DC power and a substrate on which a control circuit that operates the motor is mounted.

  ADVANTAGE OF THE INVENTION According to this invention, a handle | steering-wheel part can be made thin and short, and the electric tool with improved assembly property can be provided.

Sectional drawing of the impact driver in the 1st Embodiment of this invention. The control block diagram of the impact driver in the 1st Embodiment of this invention. Sectional drawing of the impact driver in the 2nd Embodiment of this invention. The front view of the impact driver in the 3rd Embodiment of this invention.

  Hereinafter, as an example of the electric tool of the present invention, the configuration of the impact driver 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the impact driver 1 includes a housing 2, a motor 3, a gear mechanism 4, a hammer 5, an anvil unit 6, an inverter circuit unit 7, a control unit 8, a power cord 9, Consists mainly of.

  The housing 2 is made of resin and forms the outer shell of the impact driver 1, and is mainly composed of a substantially cylindrical body portion 21, a handle portion 22 extending from the body portion 21, and a substrate housing portion 23. ing. The body part 21 has a substantially cylindrical shape, and houses the motor 3, the gear mechanism 4, the hammer 5, and the anvil part 6 in this order. In the following description, the anvil portion 6 side is defined as the front side, and the motor 3 side is defined as the rear side. Further, the direction in which the handle portion 22 extends with respect to the body portion 21 is defined as the downward direction, and the opposite is defined as the upward direction. Further, the front side in the drawing in FIG. 1 is defined as the right direction, and the opposite is defined as the left direction.

  A metal hammer case 24 in which the hammer 5 and the anvil part 6 are housed is disposed at the front side position in the body part 21. The hammer case 24 has a substantially funnel shape whose diameter gradually decreases toward the front, and an opening 24a is formed at the front end portion. The rear end surface of the body portion 21 is formed with a plurality of intake ports 21a for taking in outside air, and is shown on the side surface of the body portion 21 and outside the cooling fan 31 to be described later. A plurality of exhaust ports are formed.

  The handle portion 22 has a substantially cylindrical shape, and has an upper end connected to the body portion 21 and a lower end connected to the substrate housing portion 23. The handle portion 22 is provided with a trigger 25 which is an electronic switch, and the trigger 25 is connected to a switch mechanism 26 accommodated in the handle portion 22. Supply of electric power to the motor 3 and interruption are switched by the trigger 25. A forward / reverse switching switch (not shown), which is an electronic switch for switching the rotation direction of the motor 3, is provided at the connection portion between the handle portion 22 and the body portion 21 and immediately above the trigger 25.

  The substrate accommodating portion 23 accommodates the control portion 8, and the power cord 9 extends downward from the substrate accommodating portion 23. The board | substrate accommodating part 23 has the protrusion part 23A which protrudes in the direction (front direction) which goes to the anvil part 6 from the motor 3. As shown in FIG. The front end portion of the protruding portion 23 </ b> A is configured not to protrude forward from the tip tool holding portion 61. That is, the front end portion of the projecting portion 23 </ b> A is located closer to the motor 3 than the tip tool holding portion 61. Further, the width in the left-right direction of the substrate housing portion 23 is configured to be substantially equal to the width in the left-right direction of the body portion 21.

  The motor 3 is a brushless motor, and includes an output shaft 3A that extends in the front-rear direction, a rotor 3C that is fixed to the output shaft 3A and includes a plurality of permanent magnets 3B, and a plurality of coils 3D that are disposed so as to surround the rotor 3C. And a stator 3E. A cooling fan 31 is fixed to the front side portion of the output shaft 3A.

  The gear mechanism 4 is disposed in front of the motor 3, and the gear mechanism 4 is a reduction mechanism configured by a planetary gear mechanism having a plurality of gears, and reduces the rotation of the output shaft 3 </ b> A and transmits it to the hammer 5. doing.

  The hammer 5 includes a pair of collision portions 51 at the front end. Further, the hammer 5 is urged forward by a spring 52 and is configured to be able to move backward against the urging force of the spring.

  The anvil portion 6 is disposed in front of the hammer 5 and mainly includes a tip tool holding portion 61 and an anvil 62. The tip tool holding portion 61 is formed in a cylindrical shape and is rotatably supported by the hammer case 24. A drill 61a into which a bit (not shown) is inserted is formed in the front tool holding portion 61 in the front-rear direction, and a chuck 61B for holding a bit (not shown) is provided at the front end portion of the tip tool holding portion 61. It has been.

  The anvil 62 is configured to be integrated with the tip tool holding portion 61 in the hammer case 24 at the rear of the tip tool holding portion 61, and is disposed at a counter electrode with respect to the rotation center of the tip tool holding portion 61. It has a colliding part 62A. When the hammer 5 rotates, the one collision part 51 and the one colliding part 62A collide with each other, and at the same time, the other collision part 51 and the other colliding part 62A collide with each other. The anvil 62 is hit. In addition, after the collision between the collision portion 51 and the colliding portion 62 </ b> A, the hammer 5 moves backward while rotating against the urging force of the spring 52. When the collision part 51 gets over the collision part 62A, the elastic energy stored in the spring 52 is released, the hammer 5 moves forward, and the collision part 51 and the collision part 62A collide again. Become.

The inverter circuit section 7 is composed of a MOSFET (Metal
Magnetic force of an inverter circuit 7A composed of a switching element 7a such as an Oxide Semiconductor Field Effect Transistor (IGBT) or an IGBT (Insulated Gate Bipolar Transistor) and a sensor magnet (not shown) for detecting the rotational position of the rotor 3C or a permanent magnet 3B of the rotor 3C. And a Hall element 7B (FIG. 2) for detecting The control unit 8 is accommodated in the substrate accommodation unit 23. The control unit 8 controls the rotation speed of the motor 3 by adjusting the amount of power supplied to the motor 3 according to the operation amount of the trigger 25. The detailed configuration of the control unit 8 will be described later. The power cord 9 supplies power to the control unit 8 by connecting to an AC power source (not shown).

  The control unit 8 includes a control circuit unit 8A and a power supply circuit unit 8B. The control circuit portion 8 </ b> A is disposed in the substrate housing portion 23 at a position closest to the handle portion 22. As shown in FIG. 2, the control circuit unit 8A includes a control circuit board 80. The control circuit board 80 is provided with a rotational position detection circuit 81, a calculation unit 82, and a control signal output circuit 83. Yes.

  The rotational position detection circuit 81 detects the rotational position of the rotor 3C based on the signal from the hall element 7B and outputs the rotational position to the calculation unit 82. Although not shown, the calculation unit 82 is a central processing unit (CPU) for outputting a drive signal based on the processing program and data, a ROM for storing the processing program and control data, and temporary storage of data. RAM and a timer are provided. The calculation unit 82 generates a PWM signal based on the signal from the rotational position detection circuit 81 and outputs the PWM signal to the control signal output circuit 83. The control signal output circuit 83 outputs a PWM signal to the inverter circuit 7A.

  The calculation unit 82 is connected to the trigger 25 which is an electronic switch and a forward / reverse switching switch (not shown), and controls the number of rotations of the motor 3 according to the operation amount of the trigger 25 to switch forward / reverse switching (not shown). The direction of rotation of the motor 3 is switched according to the switching of the switch.

  As shown in FIG. 1, the power supply circuit portion 8B is disposed in the board housing portion 23 between the power cord 9 and the control circuit portion 8A, that is, below the control circuit portion 8A. As shown in FIG. 2, the power supply circuit unit 8B includes a power supply circuit board 84. The power supply circuit board 84 includes a capacitor 85, a choke coil 86, a diode bridge 87, a film capacitor 88, and a switching power supply circuit 89. And are provided.

  The capacitor 85 and the choke coil 86 remove (reduce) noise generated by the inverter circuit 7A. The diode bridge 87 full-wave rectifies the AC power supplied from the power cord 9. The film capacitor 88 smoothes the full-wave rectified current.

  The AC 100V power source supplied from the power cord 9 connected to the AC power source 12 is rectified by the diode bridge 87 and then partially reduced to 18V by the switching power source circuit 89 and supplied to the control circuit unit 8A as a driving power source. Is done. The remainder is boosted to 140 V as a driving power source for the motor 3 and supplied to the inverter circuit 7A. The power supply circuit portion 8B is covered with a container 90, and the inside of the container 90 is filled with urethane. That is, each element of the power supply circuit unit 8B is fixed by urethane and at the same time is insulated, vibration-proof and waterproof.

  Further, the capacitor 85, the diode bridge 87, and the switching power supply circuit 89 are arranged on a substrate in the container 90, and the choke coil 86 and the film capacitor 88 are outside the container 90 as shown in FIG. It is arrange | positioned at the front-end part of 23 A of more forward protrusions. Further, the choke coil 86 and the film capacitor 88 are arranged at a position on the side opposite to the handle portion 22 with respect to the control circuit portion 8A (control circuit board 80) in the vertical direction. Further, in the substrate housing portion 23, a pressing member 11 made of rubber or urethane is disposed around the choke coil 86 and the film capacitor 88, and the choke coil 86 and the film capacitor during the operation of the impact driver 1 are arranged. I'm holding 88 swings. That is, in the substrate housing portion 23 (projecting portion 23A), the control circuit portion 8A is disposed on the upper side, the power circuit portion 8B, the choke coil 86, and the film capacitor 88 are disposed below the control circuit portion 8A. It arrange | positions at the front side of the circuit part 8B.

  A plurality of signal lines 10 extend from the control circuit unit 8A and the power supply circuit unit 8B, and are electrically connected to the switch mechanism 26 and the inverter circuit unit 7 through the handle unit 22.

  Next, the operation of the impact driver 1 will be described. When the power cord 9 is connected to a power source (not shown) and the operator pulls the trigger 25 in this state, the motor 3 rotates at a rotational speed corresponding to the pulling margin. At the same time, the cooling fan 31 also rotates to take outside air from the intake port 21a. The outside air cools the inverter circuit unit 7 and the motor 3 and is discharged to the outside through an exhaust port (not shown). As the motor 3 rotates, the hammer 5 strikes the anvil 6 and a tip tool (not shown) rotates. When the operator releases the trigger 25, the motor 3 stops.

  As described above, since the choke coil 86 and the film capacitor 88 are accommodated in the substrate accommodating portion 23, interference of the signal line 10 passing through the handle portion 22 can be prevented, and consequently the signal line 10 is disconnected. Can be prevented. In addition, the wiring of the signal line 10 in the handle portion 22 is facilitated, that is, the signal line 10 can be wired at the place where the conventional noise removing member is disposed, so that the assembly of the impact driver 1 can be improved. . Further, since the choke coil 86 and the film capacitor 88 are not disposed in the handle portion 22, the grip portion of the handle portion 22 can be made thin and short.

  Further, since the choke coil 86 and the film capacitor 88 are disposed at the front end portion of the protruding portion 23A of the substrate housing portion 23, the vertical length of the impact driver 1 can be shortened, and the entire impact driver 1 can be reduced. Can be made compact. Further, it is possible to prevent the board accommodating portion 23 that accommodates the choke coil 86 and the film capacitor 88 from interfering with the operation during work. Furthermore, since the choke coil 86 and the film capacitor 88 are disposed in the vicinity (next to) the power supply circuit portion 8B to which they are connected, this wiring can be shortened, and the wiring can be facilitated and disconnection can be prevented. . Moreover, the vertical dimension of the board | substrate accommodating part 23 can also be suppressed by arrange | positioning in the vertical direction at the substantially the same position as the power supply circuit part 8B.

  Further, since the front end portion of the projecting portion 23A is positioned on the motor 3 side with respect to the tip tool holding portion 61, the projecting portion 23A does not hit the workpiece during work, and the projecting portion 23A hinders the work. Can be prevented.

  Further, since the choke coil 86 and the film capacitor 88 are arranged at the position on the side opposite to the handle portion 22 with respect to the control circuit portion 8A (control circuit board 80) in the vertical direction, the signal line 10 in the handle portion 22 is disposed. Can be prevented, and as a result, disconnection of the signal line 10 can be prevented. Moreover, since the wiring of the signal line 10 in the handle portion 22 becomes easy, the assemblability of the impact driver 1 can be improved. Further, since the choke coil 86 and the film capacitor 88 are not disposed in the handle portion 22, the grip portion of the handle portion 22 can be made to have an appropriate thickness and can be shortened.

  Further, since the pressing member 11 is disposed around the choke coil 86 and the film capacitor 88 in the substrate housing portion 23, the choke coil 86 and the film capacitor 88 are prevented from shaking during the operation of the impact driver 1. be able to.

  Next, the configuration of the impact driver 101 according to the second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  As shown in FIG. 3, the board | substrate accommodating part 123 has 1st protrusion part 123A which protrudes ahead, and 2nd protrusion part 123B which protrudes back. The first protruding portion 123A accommodates the front side portions of the control circuit portion 8A and the power supply circuit portion 8B, and the second protruding portion 123B accommodates the choke coil 86 and the film capacitor 88. In the second protrusion 123B, a pressing member 111 made of rubber or urethane is disposed around the choke coil 86 and the film capacitor 88.

  The impact driver 101 of the present embodiment can achieve the same effects as the impact driver 1 of the first embodiment. Furthermore, since the rear end portion of the second projecting portion 123B does not protrude rearward from the rear end portion of the body portion 21, the second projecting portion 123B does not interfere with the work.

  Next, the configuration of the impact driver 201 according to the third embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  As shown in FIG. 4, the width in the left-right direction of the substrate housing portion 223 is configured to be wider than the width in the left-right direction of the body portion 21. The choke coil 86 and the film capacitor 88 are respectively disposed on the sides of the container 90 of the power supply circuit unit 8B in the left-right direction. That is, the choke coil 86 and the film capacitor 88 are disposed at the position on the side opposite to the handle portion 22 with respect to the control circuit portion 8A (control circuit board 80) in the vertical direction. Within the substrate housing portion 223, a pressing member 211 made of rubber or urethane is disposed around the choke coil 86 and the film capacitor 88, respectively.

  The impact driver 201 of the present embodiment can achieve the same effects as the impact driver 1 of the first embodiment.

  The power tool of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the above-described embodiment, the impact driver 1 has been described as an electric tool. However, the electric power tool is not limited to an impact driver as long as the electric tool is mounted with a brushless motor and driven by an AC power supply. In the above-described embodiment, the shaking of the choke coil 86 and the film capacitor 88 is suppressed by the pressing member. However, a rib that supports the choke coil 86 and the film capacitor 88 is provided on the inner peripheral surface of the substrate housing portion 23, and the rib Accordingly, the choke coil 86 and the film capacitor 88 may be configured to suppress shaking.

  Further, in the above embodiment, the choke coil 86 and the film capacitor 88 are arranged at the position on the side opposite to the handle portion 22 with respect to the control circuit portion 8A (control circuit board 80) in the vertical direction. In the direction, the control circuit unit 8A (control circuit board 80) may be disposed at substantially the same position. In other words, the choke coil 86 and the film capacitor 88 may be arranged in a direction other than the upper side of the control circuit unit 8A (control circuit board 80) in the vertical direction. This is because when arranged on the upper side of the control circuit unit 8A, the signal line from the control circuit unit 8A interferes with the choke coil 86 and the film capacitor 88, so that the assemblability is poor and there is a risk of disconnection or the like. . Further, the choke coil 86 and the film capacitor 88 may be disposed below the power supply circuit unit 8B.

DESCRIPTION OF SYMBOLS 1 ... Impact driver 2 ... Housing 3 ... Motor 9 ... Power cord 11, 111, 211 ... Holding member 8B ... Power supply circuit part 21 ... Body part 22 ... Handle part 23 ... Board accommodation part 61・ ・ Tip tool holder 86 ・ ・ Choke coil 88 ・ ・ Film capacitor

Claims (9)

A motor,
A body portion for housing the motor, a substrate housing portion for housing a substrate on which a control circuit for operating the motor is mounted, and a handle having one end connected to the body portion and the other end connected to the substrate housing portion A housing having a portion;
A power cord extending from the substrate housing and connectable to an AC power source;
A power tool having a noise removing component for removing noise, and having a power supply circuit unit that converts AC power supplied from the power cord into DC power,
The noise removal component is housed in the board housing portion. The body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the body portion along one direction in the order,
The power tool according to claim 1, wherein the noise removing component is disposed at an end portion on the one-direction side in the substrate housing portion. The body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the body portion along one direction in the order,
The said board | substrate accommodating part protrudes in the said one direction, The said one direction side edge part of the said board | substrate accommodating part is located in the said motor side rather than the said front-end | tip tool holding part. The electric tool described. The body portion is provided with a tip tool holding portion for holding a tip tool, and the motor and the tip tool holding portion are provided in the body portion along one direction in the order,
The electric power tool according to claim 1, wherein the noise removing component is disposed at an end portion on the opposite side to the one-direction side in the substrate housing portion.   The noise removing component is disposed at substantially the same position as the substrate or a position on the side opposite to the handle with respect to the substrate in a direction in which the body portion, the handle portion, and the substrate housing portion are arranged. The power tool according to claim 1, wherein   The power tool according to claim 1, wherein a pressing member that suppresses shaking of the noise removing component is disposed in the substrate housing portion.   The power tool according to claim 1, wherein the noise removing component is a choke coil and a capacitor. A motor having a rotating shaft extending in the front-rear direction;
A housing having a body portion that accommodates the motor, a handle portion extending from the body portion, and a protruding portion that is provided at an end portion of the handle portion on the opposite side of the body portion and protrudes forward and / or backward. ,
A power cord extending from the protrusion and connectable to an AC power source;
An electric tool having a noise removing component for removing noise,
The noise removal component is housed in the protruding portion. The power supply circuit unit for converting AC power supplied from the power cord into DC power and a board on which a control circuit for operating the motor is mounted is accommodated in the projecting portion. 8. The electric tool according to 8.

Images